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Pulwell technology:
Advancement in process and composite materials technology is our
ongoing goal.We continue to be innovative and invest heavily in technology
research and development to ensure that our products maintain their reputation
for excellence.
Pulwell's engineering design service can assist in all technical aspects of your
requirement, analyzing the optimum profile shape and all other aspects to
ensure that the design is technically correct for the application.
The Pultrusion Process
Pultrusion is a manufacturing process
for producing continuous lengths of FRP structural shapes. Raw materials
include a liquid resin mixture and reinforcing fibers. The process involves
pulling these raw materials through a heated steel forming die using a
continuous pulling device. The reinforcement materials are in continuous forms
such as rolls of fiberglass mat or doffs of fiberglass roving. As the
reinforcements are saturated with the resin mixture in the resin impregnator
and pulled through the die, the gelation of the resin is initiated by the heat
from the die and a rigid, cured profile is formed that corresponds to the shape
of the die.
While pultrusion machine design varies
with part geometry, the basic pultrusion process concept is described in the
following schematic.
The creels position the reinforcements
for subsequent feeding into the guides. The reinforcement must be located
properly within the composite and controlled by the reinforcement guides.
The resin impregnator saturates the
reinforcement with a solution containing the resin, fillers, pigment, and
catalyst plus any other additives required. The interior of the resin
impregnator is carefully designed to optimize the "wet-out" of the
reinforcements.
On exiting the resin impregnator, the
reinforcements are organized and positioned for the eventual placement within
the cross section form by the preformer. The preformer is an array of tooling
which squeezes away excess resin as the product is moving forward and gently
shapes the materials prior to entering the die. In the die the thermosetting
reaction is heat activated and the composite is cured .
On exiting the die, the cured profile
is pulled to the saw for cutting to length. It is necessary to cool the hot
part before it is gripped by the pull block to prevent cracking and/or
deformation by the pull blocks. Two distinct pulling systems are used: a
caterpillar counter-rotating type and a hand-over-hand reciprocating type.
Pullwinding process
Pullwinding
is a method of producing high performance composite tubes combining the
techniques of conventional pultrusion and continuous filament winding. Layers
of axial fibers and helically wound fibers are combined to produce a product
with an excellent crush strength, high stiffness and superb torsional
properties.
Pullwound
profiles are available in glass or carbon fiber in combination with polyester,
vinylester, or epoxy resin systems. The ratio of axial reinforcement to helical
reinforcement can be varied to suit the specific requirements of the end use of
the products.The technology enables to optimize the wall thickness, strength
and stiffness while retaining the low weight.
For more information, Please Send
us your profile suggestions and requirements.
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Zhongshan Pulwell Composites Co;
Ltd |
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Website designed by Stephen Mu |